A connection structure for a composite backrest and a method for making the same are provided. The connection structure includes two frames, a backrest body, and metal bushings. The metal bushings include a group of left metal bushings and a group of right metal bushings. The two frames are respectively fixed to the left side and the right side of the backrest body by the left metal bushings and the right metal bushings. The method includes: punching the backrest body and the frames; placing the frames into the backrest body; processing the metal bushings; sandblasting or sanding the external surface of the metal bushing; coating a configured structural adhesive on the metal bushing, and oppositely bonding the metal bushing; fixing the bonded metal bushing by a tool; and placing the fixed metal bushing, the composite backrest and the two frames into a drying oven for heating.

Described are seat backs for passenger seats. The seat back includes a frame, and the frame includes an upper portion and a lower portion. The upper portion includes a top end of the seat back, and the lower portion is adjacent to the upper portion. A thickness of the upper portion of the frame may be less than a thickness of the lower portion of the frame.

A seat part for a vehicle seat may have a support structure which has a tubular frame and a composite component. The tubular frame may have at least one opening on a front side. A threaded sleeve may be arranged and the composite component is arranged on the front side of the tubular frame and is secured to the tubular frame via a screw screwed into the threaded sleeve.

A body weight adjustment mechanism for automatic adjustment to a balanced point is provided to improve vibration absorption characteristics and impact absorption characteristics. A torsion angle of a lower frame-side torsion bar when an upper frame is at a balanced point is found in advance, a torsion angle of the lower frame-side torsion bar in a state in which a person is seated is detected, the detected torsion angle is compared with the aforesaid balanced point torsion angle, a control signal is sent to an elastic force adjusting unit, and torsion angles of upper frame-side torsion bars are adjusted so that the torsion angle of the lower frame-side torsion bar becomes equal to the balanced point torsion angle. The upper frame can be set to an appropriate position in an initial state and a static state in which a person is seated and vibration and impact absorption characteristics are improved.

Described are base frame assemblies for a passenger seat having an elongated tube and a connector. The elongated tube may include an inner surface, an outer surface, and a connecting aperture extending from the inner surface to the outer surface. The connector may include a first end, a second end, a central opening extending from the first end to the second end, a first stopper at the first end, a second stopper proximate to the second end, a contact surface between the first stopper and the second stopper, and an adjustment slot defined as extending from the first end to the second end. The connector may be positioned within the connecting aperture such that a portion of the elongated tube contacts the contact surface between the first stopper and the second stopper that may together overlap a portion of the inner surface and outer surface of the elongated tube.

A zero-gravity seat comprises a seat base, a seat back, a front support frame, and a rear support frame. Upper ends of the front support frame and the rear support frame are respectively hinge-connected to front and rear ends of the seat base. Lower ends of the front support frame and the rear support frame are respectively hinge-connected to a seat mounting base. A lower end of the seat back can rotate around a rear end portion of the seat base. When the seat back and the seat base rotate in a linked manner, a small step difference or even no step difference is present between a lower end portion of the seat back and the upper end surface of the seat base such that the back of the occupant conforms to the seat back, thereby ensuring the comfort of a ride.

Described are modular leg assemblies for passenger seats. The modular leg assemblies can include a universal first leg member, a universal second leg member, a size specific member, and a universal seat frame tube receptor. The universal first leg member may be coupled to a first seat track fitting. The universal second leg member may be coupled to a second seat track fitting. The size specific member may be coupled to the universal first leg member and to the universal second leg member. At least one of the universal second leg member or the universal seat frame tube receptor can include a set of attachment points for coupling the universal seat frame tube receptor to the universal second leg member.

A joined body includes: a thin plate including through holes; first members each including: a base portion and a protruding portion inserted into one of the through holes; and a second member placed oppositely to the base portion via the thin plate and made of a material that is of a same kind as a material of the first members. The thin plate is made of a material having a specific gravity smaller than the materials of the first and the second members. The second member and an end portion of the protruding portion are connected together by melt-solidification. A post-joining hardness difference in a range of 30% along a direction orthogonal to a joint interface between the second member and the protruding portion, the range being centered on the joint interface, is equal to or less than 90% of a pre-joining hardness difference.

A fastening assembly includes a receiving seat and a clip having an operation portion, a holding portion, an insertion portion, and a pair of connection leg portions. The receiving seat includes a neck portion and a receiving channel. The insertion portion connects to the operation portion by the pair of connection leg portions, and the holding portion connects to the operation portion. When the clip is mounted on the neck portion of the receiving seat, the insertion portion of the clip is at least partially inserted into the receiving channel through the opening in a first neck portion side wall, and the holding portion of the clip abuts against a second neck portion side wall. When a pushing force is applied to the operation portion toward the neck portion, the insertion portion can be withdrawn from the receiving channel, such that the clip can be removed from the receiving seat.

A sliding device for a vehicle seat is provided. The sliding device includes a pair of parallel slideways, each of which comprises a lower rail, an upper rail slidably mounted to the lower rail and a latch for allowing/preventing a movement of the upper rail relative to the lower rail. A releasing member is provided for driving the latches to a position in which the upper rails are free to move relative to the lower rails. Each latch has a rear portion which is bent into a “U”-like shape and comprises a lower leg carrying latching elements configured to cooperate with corresponding latching elements provided in the lower rail and an upper leg configured to engage the releasing member. The design of the latches improves the reliability of the sliding device.